CN109396349A - A kind of investment precision casting technology of small thin-wall - Google Patents
A kind of investment precision casting technology of small thin-wall Download PDFInfo
- Publication number
- CN109396349A CN109396349A CN201811651785.3A CN201811651785A CN109396349A CN 109396349 A CN109396349 A CN 109396349A CN 201811651785 A CN201811651785 A CN 201811651785A CN 109396349 A CN109396349 A CN 109396349A
- Authority
- CN
- China
- Prior art keywords
- casting
- wax
- shell
- wall
- small thin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
- B22C9/043—Removing the consumable pattern
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/08—Shaking, vibrating, or turning of moulds
Abstract
The present invention provides a kind of investment precision casting technology of small thin-wall, comprising the following steps: wax-pattern group, shell processed, wax melting, roasting, casting, shelling and surface treatment processed.The present invention rationally designs step and technological parameter in casting technique, improves the castability of small thin-wall；The casting flaws such as stomata, sand holes have been eliminated using the precision casting that technique of the invention produces, surface roughness reaches Ra1.6--6.3, dimensional accuracy is up to CT4--6, casting stability is good, really realize few cutting even without cutting, the machining expense of casting is reduced, and improves the quality scale of product, can be widely applied to the industries such as hardware tool, architectural hardware, fluid chemical industry, lock class, valve class, engineering machinery, auto parts, medical instrument.
Description
Technical field
The present invention relates to Investment casting technology field more particularly to a kind of precision-investment casting works of small thin-wall
Skill.
Background technique
Hot investment casting is a kind of casting method for traditional casting technique, it can obtain relatively accurate landform
Shape and higher casting accuracy.Be compared with widespread practice: make first required blank (can made allowance it is very small or do not stay remaining
Amount) electrode, then with electrode corrosion mode it is specific, formed cavity；Wax is cast with the method for casting again, obtains original wax-pattern；?
Liquid sand material resistant to high temperature is painted on wax-pattern from level to level；It dries, then heats after enough thickness to be obtained, make internal wax-pattern
It melts away, obtains and the consistent type chamber of required blank；It casts in type chamber again molten iron, shell is peeled off after solidification, can be obtained
Obtain the finished product of precision manufactureing.
Full form casting process, is briefly exactly that meltability model is made with fusible material, and it is special to coat several layers on it
Fireproof coating, melt model from shell after dry and hardening forms a whole shell, then with steam or hot water, so
Shell is placed in sandbox afterwards, dry moulding is filled in its surrounding, finally casting mold is put into roaster by high-temperature roasting, casting
After type or shell are fired, Yu Qizhong casting molten metal and obtain casting.
But existing defects are designed for the full form casting process of small thin-wall in the prior art, it is easy to cause casting
Part solidification shrinkage is big, generates shrinkage cavity and porosity phenomenon, influences the size and product quality of casting.
Summary of the invention
The purpose of the present invention is to provide a kind of investment precision casting technologies of small thin-wall, rationally design founder
Step and technological parameter in skill, improve the castability of small thin-wall.
To achieve the above object, present invention employs following technical solutions:
A kind of investment precision casting technology of small thin-wall, it is characterised in that: the following steps are included:
Step S1: wax-pattern group processed makes mold according to the drawing requirement of product, and Xiang Suoshu mold is pressed into cerul mould material, and by institute
It is cooling to state mold, the wax-pattern is cooled down again after taking out wax-pattern；The wax-pattern and casting rod wax group are welded into wax-pattern group；
Step S2: shell processed, by the wax-pattern group immerse fireproof coating in, make its surface uniformly soak extension fireproof coating, then again to
Its surface sprinkles one layer of thin silica sand, is put into curing agent and hardens；It so repeats 5-10 times, the outer layer of the wax-pattern group is made to form 4-
The hard shell of 5mm thickness；
Step S3: wax melting, the wax-pattern group after shell processed, which is placed in the hot water that temperature is 62-68 DEG C, melts the wax-pattern group
Outflow, obtains shell, and the shell is dried；
Step S4: the shell after drying is placed in roaster by roasting, is gradually heated up to 1060-1120 DEG C, is sintered 1-2
Hour；
Step S5: casting, by the shell after melted potting syrup injection roasting, the temperature of potting syrup is 1580-
It 1620 DEG C, needs when casting quick；High frequency micro vibration is carried out to the shell in casting process, keeps the potting syrup in the shell equal
It is even, the defects of reducing the stomata of cast-internal；
Step S6: shelling and surface treatment, the shell natural cooling 2 hours or more after casting, by the shell of casting exterior
It removes, scale blowing cuts cast gate residue, the casting is placed in shot-blasting machine and carries out removing surface, removes flash removed.
Preferably, the shrinking percentage of cerul mould material described in step S1 should be less than 1.2%.
Preferably, fireproof coating described in step S2 is mixed as required by zircon, magnesia and binder etc., stirs 2-
It is made within 6 hours.
Preferably, thin silica sand described in step S2 is 80-120 mesh, 30-60 mesh or 16-30 mesh.
Compared with prior art, the present invention provides a kind of investment precision casting technology of small thin-wall, rationally designs
Step and technological parameter in casting technique, improve the castability of small thin-wall；It is produced using technique of the invention
Precision casting has eliminated the casting flaws such as stomata, sand holes, and surface roughness reaches Ra1.6--6.3, dimensional accuracy up to CT4--6,
Casting stability is good, really realizes that few cutting even without cutting, reduces the machining expense of casting, and improve the matter of product
Measure class.
Detailed description of the invention
Nothing.
Specific embodiment
To make to have further understanding to the purpose of the present invention, construction, feature and its function, hereby cooperate embodiment detailed
It is described as follows.
A kind of investment precision casting technology of small thin-wall, it is characterised in that: the following steps are included:
Step S1: wax-pattern group processed makes mold according to the drawing requirement of product, is pressed into cerul mould material to mold, and mold is cold
But, wax-pattern is cooled down again after taking out wax-pattern；Wax-pattern and casting rod wax group are welded into wax-pattern group；
Step S2: shell processed immerses wax-pattern group in fireproof coating, so that its surface uniformly soak extension fireproof coating, then Xiang Qibiao again
Face sprinkles one layer of thin silica sand, is put into curing agent and hardens；It so repeats 5-10 times, the outer layer of wax-pattern group is made to form 4-5mm thickness
Hard shell；Preferably, the shrinking percentage of cerul mould material should be less than 1.2%；
Step S3: wax melting, the wax-pattern group after shell processed, which is placed in the hot water that temperature is 62-68 DEG C, makes wax-pattern group melt outflow, obtains
It is dried to shell, and to shell；
Step S4: the shell after drying is placed in roaster by roasting, is gradually heated up to 1060-1120 DEG C, is sintered 1-2 hours；
The purpose of Baking is to increase the intensity and gas permeability of shell in order to remove remaining moisture, impurity in shell, shell is made to exist
There is good gas permeability when casting, prevents casting from the defects of stomata occur；Roasting can improve the mechanical behavior under high temperature of shell, subtract
The temperature difference of few potting syrup and shell, improves the mold-filling capacity of potting syrup；
Step S5: casting, by the shell after melted potting syrup injection roasting, the temperature of potting syrup is 1580-1620 DEG C,
It is needed when casting quick；High frequency micro vibration is carried out to shell in casting process, keeps the potting syrup in shell uniform, reduces cast-internal
Stomata the defects of；When casting, it should accomplish that drainage is quasi-, beam is fast, receipts stream is slow, not stop, to guarantee the quality of casting, avoid casting
Occur stomata or oxidizing slag inside part；Drainage standard is exactly to require the sprue cup of shell just on the flow pass of potting syrup；Note
Stream refers to just starting fastly wanting when casting quickly, preventing casting liquid measure is few from generating splashing on shell surface and forming steel beans or sheet
Object；It is exactly to require to be poured at a slow speed in the middle and later periods of casting that it is slow, which to receive stream, to guarantee casting potting syrup more as far as possible, enhances feeding；No
Cutout is exactly not allow potting syrup to have interruption in casting process, and avoiding cold shut influences casting quality；
Step S6: shelling and surface treatment shell natural cooling 2 hours or more after casting, the shell of casting exterior are removed,
Scale blowing cuts cast gate residue, and casting is placed in shot-blasting machine and carries out removing surface, removes flash removed.
When carrying out above-mentioned steps, it should ensure that production environment is 25 DEG C or so, to guarantee preferable production effect.
Preferably, fireproof coating is mixed as required by zircon, magnesia and binder etc. in step S2, and stirring 2-6 is small
When be made.
Preferably, thin silica sand is 80-120 mesh, 30-60 mesh or 16-30 mesh in step S2.Innermost layer is thin during shell processed
Silica sand is 80-120 mesh, and the thin silica sand of middle layer is 30-60 mesh, and outermost thin silica sand is 16-30 mesh, to guarantee manufactured type
Shell has enough comprehensive performances.
The present invention provides a kind of investment precision casting technology of small thin-wall, rationally designs the step in casting technique
And technological parameter, improve the castability of small thin-wall；Gas has been eliminated using the precision casting that technique of the invention produces
The casting flaws such as hole, sand holes, surface roughness reach Ra1.6--6.3, and dimensional accuracy is up to CT4--6, and casting stability is good, really
Realize that few cutting even without cutting, reduces the machining expense of casting, and improve the quality scale of product, can be widely applied
In industries such as hardware tool, architectural hardware, fluid chemical industry, lock class, valve class, engineering machinery, auto parts, medical instruments.
The present invention is described by above-mentioned related embodiment, however above-described embodiment is only to implement example of the invention.
It must be noted that the embodiment disclosed is not limiting as the scope of the present invention.On the contrary, do not depart from spirit of the invention and
It is changed and retouched made by range, belongs to scope of patent protection of the invention.
Claims (4)
1. a kind of investment precision casting technology of small thin-wall, it is characterised in that: the following steps are included:
Step S1: wax-pattern group processed makes mold according to the drawing requirement of product, and Xiang Suoshu mold is pressed into cerul mould material, and by institute
It is cooling to state mold, the wax-pattern is cooled down again after taking out wax-pattern；The wax-pattern and casting rod wax group are welded into wax-pattern group；
Step S2: shell processed, by the wax-pattern group immerse fireproof coating in, make its surface uniformly soak extension fireproof coating, then again to
Its surface sprinkles one layer of thin silica sand, is put into curing agent and hardens；It so repeats 5-10 times, the outer layer of the wax-pattern group is made to form 4-
The hard shell of 5mm thickness；
Step S3: wax melting, the wax-pattern group after shell processed, which is placed in the hot water that temperature is 62-68 DEG C, melts the wax-pattern group
Outflow, obtains shell, and the shell is dried；
Step S4: the shell after drying is placed in roaster by roasting, is gradually heated up to 1060-1120 DEG C, is sintered 1-2
Hour；
Step S5: casting, by the shell after melted potting syrup injection roasting, the temperature of potting syrup is 1580-
It 1620 DEG C, needs when casting quick；High frequency micro vibration is carried out to the shell in casting process, keeps the potting syrup in the shell equal
It is even, the defects of reducing the stomata of cast-internal；
Step S6: shelling and surface treatment, the shell natural cooling 2 hours or more after casting, by the shell of casting exterior
It removes, scale blowing cuts cast gate residue, the casting is placed in shot-blasting machine and carries out removing surface, removes flash removed.
2. the investment precision casting technology of small thin-wall as described in claim 1, it is characterised in that: described in step S1
The shrinking percentage of cerul mould material should be less than 1.2%.
3. the investment precision casting technology of small thin-wall as described in claim 1, it is characterised in that: described in step S2
Fireproof coating is mixed as required by zircon, magnesia and binder etc., and stirring is made for 2-6 hours.
4. the investment precision casting technology of small thin-wall as described in claim 1, it is characterised in that: described in step S2
Thin silica sand is 80-120 mesh, 30-60 mesh or 16-30 mesh.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811651785.3A CN109396349A (en) | 2018-12-31 | 2018-12-31 | A kind of investment precision casting technology of small thin-wall |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811651785.3A CN109396349A (en) | 2018-12-31 | 2018-12-31 | A kind of investment precision casting technology of small thin-wall |
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| Publication Number | Publication Date |
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| CN109396349A true CN109396349A (en) | 2019-03-01 |
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| CN201811651785.3A Pending CN109396349A (en) | 2018-12-31 | 2018-12-31 | A kind of investment precision casting technology of small thin-wall |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110449551A (en) * | 2019-08-26 | 2019-11-15 | 贵州安吉航空精密铸造有限责任公司 | A kind of gravity-assist pouring investment casting method |
| CN110842138A (en) * | 2019-11-25 | 2020-02-28 | 南通市腾飞金属铸造有限公司 | Fire grate waxing and molding method |
| CN111633189A (en) * | 2020-06-13 | 2020-09-08 | 陈秀兰 | High-precision casting process |
| CN113996763A (en) * | 2021-11-08 | 2022-02-01 | 昆山莱捷有色金属有限公司 | Casting method of automobile chassis support |
| CN114346196A (en) * | 2022-01-17 | 2022-04-15 | 洛阳科品实业有限公司 | Casting forming process for small characters on ultrathin part |
| CN115090835A (en) * | 2022-06-22 | 2022-09-23 | 曹涛 | Precise casting process of hardware casting |
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| CN101658918A (en) * | 2008-08-26 | 2010-03-03 | 白聿钦 | Water glass type magnesium alloy fusible pattern casting process |
| CN101850401A (en) * | 2010-05-31 | 2010-10-06 | 上虞新达精密铸造有限公司 | Fired mold and precision casting process utilizing same |
| CN102228956A (en) * | 2011-07-11 | 2011-11-02 | 宝鸡中铁宝桥天元实业发展有限公司 | Precision fire mould casting process of series sliding bed bedplates for turnouts of high-speed railway lines for passenger transport and special die |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110449551A (en) * | 2019-08-26 | 2019-11-15 | 贵州安吉航空精密铸造有限责任公司 | A kind of gravity-assist pouring investment casting method |
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| CN111633189A (en) * | 2020-06-13 | 2020-09-08 | 陈秀兰 | High-precision casting process |
| CN111633189B (en) * | 2020-06-13 | 2021-06-04 | 常熟市耀华机械有限公司 | Hanging coating machine for casting high-precision casting and casting process of casting |
| CN113996763A (en) * | 2021-11-08 | 2022-02-01 | 昆山莱捷有色金属有限公司 | Casting method of automobile chassis support |
| CN114346196A (en) * | 2022-01-17 | 2022-04-15 | 洛阳科品实业有限公司 | Casting forming process for small characters on ultrathin part |
| CN114346196B (en) * | 2022-01-17 | 2023-05-16 | 洛阳科品钛业股份有限公司 | Casting molding process of small fonts on ultrathin part |
| CN115090835A (en) * | 2022-06-22 | 2022-09-23 | 曹涛 | Precise casting process of hardware casting |
| CN115090835B (en) * | 2022-06-22 | 2023-12-29 | 繁峙县志高矿山机械有限责任公司 | Precise casting process of hardware castings |
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Application publication date: 20190301 |